Carterville, IL Radon Levels

Q: What EPA Radon Zone is Carterville in?

Carterville is in Williamson County, EPA Zone 2.

Q: How much does radon mitigation cost in Carterville?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Carterville radon levels and find certified testing and mitigation professionals to keep your home safe

Carterville, IL Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Williamson County, IL

Zip Code 62918

Southern Illinois community Carterville in Williamson County sits within the region's coal-bearing Pennsylvanian formations that generally produce moderate radon levels. While specific testing data for zip code 62918 remains limited, the area's EPA Zone 2 classification indicates moderate radon potential. Local residents should conduct home testing, as the mix of older and newer housing stock combined with variable geological conditions can influence radon accumulation significantly.

5.00

pCi/L area average

Above EPA Action Level

Williamson County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Carterville itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Carterville, IL Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Carterville, IL

No homeowner tests have been submitted for Carterville yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Marion	9.8 mi	5.00 pCi/L	1
Murphysboro	12.8 mi	10.00 pCi/L	1
Campbell Hill	28.2 mi	1.00 pCi/L	1
Mount Vernon	38.8 mi	4.00 pCi/L	1
Marissa	48.2 mi	4.00 pCi/L	1

Williamson County Radon Profile

EPA mapping assigns Williamson County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Williamson County average 5.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Williamson County home regardless of zone or a neighbor's results.

Radon FAQ for Carterville, IL

What EPA Radon Zone is Carterville in?

Carterville and the 62918 zip code are in Williamson County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Carterville?

No homeowner radon tests have been submitted for Carterville yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Williamson County average—are the best available indicator of local conditions until Carterville homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Carterville?

Radon mitigation in Carterville typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Carterville?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.